## Expressions

Type of Unit: Concept

# Prior Knowledge

Students should be able to:

- Write and evaluate simple expressions that record calculations with numbers.
- Use parentheses, brackets, or braces in numerical expressions and evaluate expressions with these symbols.
- Interpret numerical expressions without evaluating them.

# Lesson Flow

Students learn to write and evaluate numerical expressions involving the four basic arithmetic operations and whole-number exponents. In specific contexts, they create and interpret numerical expressions and evaluate them. Then students move on to algebraic expressions, in which letters stand for numbers. In specific contexts, students simplify algebraic expressions and evaluate them for given values of the variables. Students learn about and use the vocabulary of algebraic expressions. Then they identify equivalent expressions and apply properties of operations, such as the distributive property, to generate equivalent expressions. Finally, students use geometric models to explore greatest common factors and least common multiples.

- Subject:
- Mathematics, Algebra
- Level:
- Middle School
- Grade:
- 6
- Tags:

Calculators with parentheses buttons (optional, one for each student) (lesson 2)

Lesson 1

Math TricksLesson 2

Evaluating ExpressionsLesson 3

Expressions in Words & SymbolsLesson 5

Substituting Numbers for LettersLesson 6

Mathematical VocabularyLesson 9

Common MultiplesLesson 11

Peer ReviewLesson 12

Gallery Problems Exercise